This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Physics (Part I) Chapter 6 Gravitation – Quiz 12 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Physics (Part I) Chapter 6 Gravitation Quiz 12 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. An object with a mass of 48 kg measured on Earth is taken to the Moon. What is the mass of the object on the Moon's surface if the acceleration due to gravity on Moon is one-sixth of that on Earth? A) 8 kg. B) 48 kg. C) 288 kg. D) 480 kg. Show Answer Correct Answer: B) 48 kg. 2. Kepler's First Law states that planets move in elliptical orbits with the Sun at one focus. Which of the following best explains why this is significant? A) It disproved the geocentric model of the universe. B) It showed that planets move in perfect circles. C) It demonstrated that the speed of planets is constant. D) It indicated that the Sun is at the center of the universe.TagsDOK Level 2:Skill/Concept. Show Answer Correct Answer: A) It disproved the geocentric model of the universe. 3. Two particles are placed at some distance. If the mass of each of the two particles is tripled, keeping the distance between them unchanged, the value of gravitational force between them will be A) 1/9 times. B) 9 times. C) 6 times. D) 1/6 times. Show Answer Correct Answer: B) 9 times. 4. A man who weighs 1000N on the surface of the earth will weigh how much at twice the distance in the atmosphere. A) 500 N. B) 250 N. C) 2000 N. D) 4000N. Show Answer Correct Answer: B) 250 N. 5. AsAt the centre of earth, a body has a centre of mass but no centre of gravity. Reason:Acceleration due to gravity at the centre of the earth is zero. A) ) Both assertion and reason are true and reason is the correct explanation of assertion. B) Both assertion and reason are true but reason is not the correct explanation of assertion. C) Assertion is true but reason is false. D) Both Assertion and Reason are false. Show Answer Correct Answer: A) ) Both assertion and reason are true and reason is the correct explanation of assertion. 6. If Mass 1 is doubled (2m) and the distance between the two masses is doubled (2r) it will ..... A) Will double the force of gravity. B) Will halve the force of gravity. C) Will multiply the force of gravity by a factor of four. D) Will reduce the force of gravity by a factor of four. Show Answer Correct Answer: B) Will halve the force of gravity. 7. A force of attraction exists between all the objects in the universe. A) Kepler's first law. B) Kepler's second law. C) Kepler's third law. D) Newton's law of gravitation. Show Answer Correct Answer: D) Newton's law of gravitation. 8. Force acting normally on a surface is called: A) Pressure. B) Thrust. C) Both a and b. D) None. Show Answer Correct Answer: B) Thrust. 9. The value of g is ..... at the center of earth A) Zero. B) Not defined. C) 1. D) Cant be determined. Show Answer Correct Answer: A) Zero. 10. Two spherical objects have masses of 400 kg and 50 kg. Their centers are separated by a distance of 15 m. Find the change in the gravitational attraction Force between them if the first mass changes to 800 kg and the other mass and distance do not change. A) It does not change. B) It increases by a factor of 2 times stronger. C) It decreases by a factor of 1/2 as weak. D) It increases by a factor of 1/2 times stronger. Show Answer Correct Answer: B) It increases by a factor of 2 times stronger. 11. What is uniform circular motion? A) Motion at varying speeds in a circle. B) Motion in a straight line. C) Motion with increasing speed. D) Motion at constant speed in a circular path. Show Answer Correct Answer: D) Motion at constant speed in a circular path. 12. What is the formula for Newton's Law of Gravitation? A) $F = G \frac{m_1 m_2}{r^2}$. B) $F = ma$. C) $E = mc^2$. D) $F = \frac{mv^2}{r}$. Show Answer Correct Answer: A) $F = G \frac{m_1 m_2}{r^2}$. 13. Kepler's third law states that the square of the ratio of the periods of any two planets is equal to the cube of the ratio of their distances from each other A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 14. The gravitational potential energy of a system consisting of two equal point masses separated by a fixed distance is $G_1$ $G_2$ $\frac{G_1}{G_2}$ A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: A) 1. 15. The weight of a body at the surface of earth is 40 N. Its weight at the centre of earth will be A) Zero. B) Infinite. C) 40 N. D) Unpredictable. Show Answer Correct Answer: A) Zero. 16. Which scientist explained how planets speed up and slow down depending on their position in the orbit? A) Kepler. B) Brahe. C) Bruno. D) C0pernicus. Show Answer Correct Answer: A) Kepler. 17. If you were standing on the moon, and then the moon was suddenly hollowed out so that the mass of the moon decreases while keeping the same size and radius, then what effect occurs to your weight (Remember:Weight is the gravitational force ..... )? A) My weight would not change. B) My weight would increase. C) My weight would decrease. D) None of the above. Show Answer Correct Answer: C) My weight would decrease. 18. When do gravitational forces exist between two objects? A) They only exist between microscopic objects. B) They are always present between any two objects. C) Gravitational forces only act on objects falling on Earth. D) They only exist for objects in space. Show Answer Correct Answer: B) They are always present between any two objects. 19. Calculate the gravitational force between two objects with a mass of 50 kg that are 2 m apart. A) 4.2x10$^{-14}$N. B) 2.2x10$^{-8}$N. C) 4.2x10$^{-8}$N. D) 2.2x10$^{14}$N. Show Answer Correct Answer: C) 4.2x10$^{-8}$N. 20. The value of g be ..... everywhere. A) Different. B) Same. C) All the above. D) None of the above. Show Answer Correct Answer: A) Different. 21. Two factors effecting the magnitude of the gravitational force between 2 objects are ..... A) Mass and distance. B) Mass and matter. C) Distance and weight. D) Weight and mass. Show Answer Correct Answer: A) Mass and distance. 22. What happens to the gravitational force if the mass of one object is tripled? A) The gravitational force triples. B) The gravitational force is reduced to one-third. C) The gravitational force remains unchanged. D) The gravitational force doubles. Show Answer Correct Answer: A) The gravitational force triples. 23. In a frictionless room, what would happen if two blocks were placed on the floor? A) The blocks would move towards each other. B) The blocks would move away from each other. C) The blocks would remain stationary. D) The blocks would rotate around each other. Show Answer Correct Answer: A) The blocks would move towards each other. 24. For over 1, 000 years, the church supported this theory- A) Geocentric. B) Heliocentric. C) All the above. D) None of the above. Show Answer Correct Answer: A) Geocentric. 25. As the mass of an object increases, the gravitational pull of the object ..... A) Stays the same. B) Decreases. C) IncreasesTagsNGSS.HS-PS2-4. D) None of the above. Show Answer Correct Answer: C) IncreasesTagsNGSS.HS-PS2-4. ← PreviousNext →Related QuizzesClass 11 Physics (Part I) Chapter 6 Gravitation Quiz 1Class 11 Physics (Part I) Chapter 6 Gravitation Quiz 2Class 11 Physics (Part I) Chapter 6 Gravitation Quiz 3Class 11 Physics (Part I) Chapter 6 Gravitation Quiz 4Class 11 Physics (Part I) Chapter 6 Gravitation Quiz 5Class 11 Physics (Part I) Chapter 6 Gravitation Quiz 6Class 11 Physics (Part I) Chapter 6 Gravitation Quiz 7Class 11 Physics (Part I) Chapter 6 Gravitation Quiz 8Class 11 Physics (Part I) Chapter 6 Gravitation Quiz 9Class 11 Physics (Part I) Chapter 6 Gravitation Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books